Found Using Multiple SSL Certificates in Apache with One IP Address today. Basically:
<NameVirtualHost *:443> <VirtualHost *:443> ServerName www.yoursite.com DocumentRoot /var/www/site SSLEngine on SSLCertificateFile /path/to/www_yoursite_com.crt SSLCertificateKeyFile /path/to/www_yoursite_com.key SSLCertificateChainFile /path/to/DigiCertCA.crt </Virtual Host> <VirtualHost *:443> ServerName www.yoursite2.com DocumentRoot /var/www/site2 SSLEngine on SSLCertificateFile /path/to/www_yoursite2_com.crt SSLCertificateKeyFile /path/to/www_yoursite2_com.key SSLCertificateChainFile /path/to/DigiCertCA.crt </Virtual Host>